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How do you debug a regex? [closed]
Regular expressions can become quite complex. The lack of white space makes them difficult to read. I can't step though a regular expression with a debugger. So how do experts debug complex regular expressions?
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Realistic usage of the C99 'restrict' keyword?
...← *a ; Load the value of a pointer
add R2 += R1 ; Perform Addition
set R2 → *a ; Update the value of a pointer
; Similarly for b, note that x is loaded twice,
; because x may point to a (a aliased by x) thus
; the value of x will change when the value of a
; changes.
load R1 ← *x
lo...
What are some common uses for Python decorators? [closed]
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For nosetests, you can write a decorator that supplies a unit test function or method with several sets of parameters:
@parameters(
(2, 4, 6),
(5, 6, 11),
)
def test_add(a, b, expected):
assert a + b == expected
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How to use timeit module
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The way timeit works is to run setup code once and then make repeated calls to a series of statements. So, if you want to test sorting, some care is required so that one pass at an in-place sort doesn't affect the next pass with already sorted data (that,...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...ne or two value tokens that are identified.
The True command block is the set of commands after the condition, and is parsed like any other command block. If ELSE is to be used, then the True block must be parenthesized.
The optional False command block is the set of commands after ELSE. Again, thi...
Python Pandas: Get index of rows which column matches certain value
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Simple way is to reset the index of the DataFrame prior to filtering:
df_reset = df.reset_index()
df_reset[df_reset['BoolCol']].index.tolist()
Bit hacky, but it's quick!
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Is there a bash command which counts files?
...eral *.log in the $logfiles array if no files match. (See How to "undo" a 'set -x'? for examples of how to safely reset it.)
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How to fix Git error: object file is empty?
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I had a similar problem. My laptop ran out of battery during a git operation. Boo.
I didn't have any backups. (N.B. Ubuntu One is not a backup solution for git; it will helpfully overwrite your sane repository with your corrupted one.)
To the git wizards, if this wa...
How do I decode a string with escaped unicode?
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How can I run dos2unix on an entire directory? [closed]
I have to convert an entire directory using dos2unix . I am not able to figure out how to do this.
11 Answers
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